import java.util.HashSet;
import java.util.Set;

class IsogramChecker {

    boolean isIsogram(final String inputString) {
        final String innerString = inputString.toLowerCase().replaceAll("[\\s|\\-]*", "");
        final Set<Character> sets = new HashSet<>();

        for (int i = 0; i < innerString.length(); i++) sets.add(innerString.charAt(i));

        return sets.size() == innerString.length();
    }
}